<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<h1>POST请求</h1>
<form action="http://127.0.0.1:8080/a.html?a=1" method="post">
    <input name="b" value="2"><br>
    <input name="c" value="3"><br>
    <button>提交</button>
</form>

<h1>文件上传</h1>
<form action="http://127.0.0.1:8080/upload.do?a=1"
      method="post" enctype="multipart/form-data">
    <input name="b" value="2"><br>
    <input name="c" value="3"><br>
    <input type="file" name="uploadFile">
    <button>提交</button>
</form>

</body>
</html>